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06-11-2015, 12:30 AM( This post was last modified: 06-11-2015, 12:39 AM by GrizzlyClaws )
The size and the timeline of that mandible seem to be very consistent with that of the largest Panthera spealea specimen from the Ural/Western Russia, but the morphology and the geographic proximity are not.
So this may indicate a hypothesis that any Panthera species can grow huge when it has managed to seize the niche position at the top of the food chains.
During the late Pleistocene peiord, the Manchuria probably had the very similar ecological systems like that of the Ural, such as the forest steppe zone, so this is what happened when a tiger clade species managed to seize the top niche position there, they just used to grow as large as Panthera fossilis and the Panthera spelaea from the Ural.